Improvement in chain-shackles



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ELU-AH BMGS, for I-novlnonc,'ToWN, MASSACHUSETTS.

Letters Paten-t No. 99,623, dated February 8, 1,870.

IMPROVEMENT IN CHAIN-SHA'CKLES.

The Schedule referred to ngthese Letters P atent and making part of thesame To'a'll persons vto whom these presents-mancanze'.-

vBe it known tha-t1, ELJAH BANGS, Vof Provincetown', ofthe county of4Barnstable, and State of Mzisf sac-husetts, have invented aI new and-nseful Improvelnent'in' Clmin-Slmckles; endclo hereby declarefthe sameto be nllydescribetl Vin Ithe following specificetion, and representedin 'the' accompanyingdrawings,f of which- 1 Fignrel'is e fronteleyation,and

Figure,2:L'lugitndinal section of one of ,1ny'im proved shackles'. il fThe common chain-shackle usually has the'bolt of its 'bowed link -heldin plece on the 1ink,\ byimeens of i keyinserted through 'n slot madetransversely through the bolt.I lhis keyis liable to become rusted oroxid- ,ized` by sea-water-or exposure, so as to render it difticnlt toremove it from the bolt in cases of emergency'.

and besides,-the necessary extension of the bolt, toreceire the`key,ci1uses the -bolt andthe keytoY project so'y nl nch beyond thelin`k, 'ns to bein the way, or be hable to be 'caught against objects,and broken or injured .whilethe shackle'nmy be in use.

The objection to^the employment of n,- screw and mit to holdvthe holtinplc'e, (the tln'ea'il'of-the `screw being cut on" the bolt has been,that the bolt and screw-are liable to become oxidnted and set together,

. I have made an'improveinent'whiclrnot only ennbles thekey to beVdispensed with, and the advantages of the nut and. screw robe secured,but obviates vthe-danger'ot'oxidation ofthe screws, and their' adhesion,myl said-improvement causingsthethreadsof the screws to be wholly out.of the influence of. sea-water, and to be preservedvn theirnormal-condition. i

'in carrying ont nay-invention, Ifsoc'ket the lower4 endlof'the bolt Bofthe bowed link A, (see figs. 1 and Zot' the drawings and form-in itz'i."temztle screw,.a, lntving ye countersink or conical' mouth, 11,and-with such screwl employ n short 'or auxiliary-bolt, Opcion-- sisting ofa male screw, b, l'and :ypris'mntic heed, c, the,

letter corresponding in4 size end form to the henlvd'L of 4 the mainbolt B.v i v'Before screwing the screw b into the female-screw of. themain bolt-,fl'plnce on the screw b"so es to encompass it, a thickwasheno-D, of a Awater-proof and `yielding'orelastic material, spu'rches Indie rubber, for

instance, which, when the auxiliary bolt is set up into the mein b olt,shell be` forcedA into the conical month b, so'as Vtojbe 4ineke ewater-tight joint between-the Whitt? Irclni'm as niy'- invention orimprovement nitty be stated esfollo'ws, vizz g y f The combination andarrangement of the auxiliary4 l'screw-bolt C andthe elastic washer D,with the bowed link A'of the chain-shackle, and with the main bolt Bsocketed andj provided with e female screw, substantiellyl as described.v 4

' ELIJAH. BANGS.

Witnesses-- R. H. EDDY, J. R. SNOW.

